Christina Hendricks says it’s going to be difficult when the seventh and final season of “Mad Men” starts filming this November.

“I just want to milk it as long as possible,” said Hendricks, who plays Joan Harris on the critically acclaimed AMC drama. “I want to really enjoy this last season every second that I can because it’s been a really special time for me and a really special show.”

Hendricks was speaking from Chicago this week where she was hosting the opening of the city’s Magnificent Mile Shopping Festival.

She talked about the show’s signature style, too, created by costumer designer Janie Bryant.

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When Joan got married, she started wearing higher necklines, and power suits joined the character’s rotation when she was promoted at the show’s advertising agency, Hendricks said.

One constant since the AMC show debuted in 2007 has been Hendricks’ updo.

“I think it also helps describe her character because she’s very sort of in control and likes things in order and everything just as it is,” Hendricks said. “So why wouldn’t her hair be?”